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<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> *  Copyright 2001-2005 Stephen Colebourne</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> *  Licensed under the Apache License, Version 2.0 (the "License");</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> *  you may not use this file except in compliance with the License.</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> *  You may obtain a copy of the License at</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> *  Unless required by applicable law or agreed to in writing, software</em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> *  distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> *  See the License for the specific language governing permissions and</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> *  limitations under the License.</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.goda.time.chrono;
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> java.io.Serializable;
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.util.HashMap;
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.util.Map;
<a name="21" href="#21">21</a>  
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> org.goda.time.Chronology;
<a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> org.goda.time.DateTime;
<a name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> org.goda.time.DateTimeConstants;
<a name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> org.goda.time.DateTimeField;
<a name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> org.goda.time.DateTimeZone;
<a name="27" href="#27">27</a>  
<a name="28" href="#28">28</a>  <em class="jxr_javadoccomment">/**</em>
<a name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * Implements the Islamic, or Hijri, calendar system using arithmetic rules.</em>
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * This calendar is a lunar calendar with a shorter year than ISO.</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * Year 1 in the Islamic calendar began on July 16, 622 CE (Julian), thus</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * Islamic years do not begin at the same time as Julian years. This chronology</em>
<a name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * is not proleptic, as it does not allow dates before the first Islamic year.</em>
<a name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> * There are two basic forms of the Islamic calendar, the tabular and the</em>
<a name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * observed. The observed form cannot easily be used by computers as it</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> * relies on human observation of the new moon.</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> * The tabular calendar, implemented here, is an arithmetical approximation</em>
<a name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> * of the observed form that follows relatively simple rules.</em>
<a name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> * The tabular form of the calendar defines 12 months of alternately</em>
<a name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> * 30 and 29 days. The last month is extended to 30 days in a leap year.</em>
<a name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> * Leap years occur according to a 30 year cycle. There are four recognised</em>
<a name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> * patterns of leap years in the 30 year cycle:</em>
<a name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> * Years 2, 5, 7, 10, 13, 15, 18, 21, 24, 26 &amp; 29 - 15-based, used by Microsoft</em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> * Years 2, 5, 7, 10, 13, 16, 18, 21, 24, 26 &amp; 29 - 16-based, most commonly used</em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * Years 2, 5, 8, 10, 13, 16, 19, 21, 24, 27 &amp; 29 - Indian</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> * Years 2, 5, 8, 11, 13, 16, 19, 21, 24, 27 &amp; 30 - Habash al-Hasib</em>
<a name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * You can select which pattern to use via the factory methods, or use the</em>
<a name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> * default (16-based).</em>
<a name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> * This implementation defines a day as midnight to midnight exactly as per</em>
<a name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> * the ISO chronology. This correct start of day is at sunset on the previous</em>
<a name="57" href="#57">57</a>  <em class="jxr_javadoccomment"> * day, however this cannot readily be modelled and has been ignored.</em>
<a name="58" href="#58">58</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="59" href="#59">59</a>  <em class="jxr_javadoccomment"> * IslamicChronology is thread-safe and immutable.</em>
<a name="60" href="#60">60</a>  <em class="jxr_javadoccomment"> *</em>
<a name="61" href="#61">61</a>  <em class="jxr_javadoccomment"> * @see &lt;a href="<a href="http://en.wikipedia.org/wiki/Islamic_calendar" target="alexandria_uri">http://en.wikipedia.org/wiki/Islamic_calendar</a>"&gt;Wikipedia&lt;/a&gt;</em>
<a name="62" href="#62">62</a>  <em class="jxr_javadoccomment"> *</em>
<a name="63" href="#63">63</a>  <em class="jxr_javadoccomment"> * @author Stephen Colebourne</em>
<a name="64" href="#64">64</a>  <em class="jxr_javadoccomment"> * @since 1.2</em>
<a name="65" href="#65">65</a>  <em class="jxr_javadoccomment"> */</em>
<a name="66" href="#66">66</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/goda/time/chrono/BasicChronology.html">BasicChronology</a> {
<a name="67" href="#67">67</a>  
<a name="68" href="#68">68</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Serialization lock */</em>
<a name="69" href="#69">69</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = -3663823829888L;
<a name="70" href="#70">70</a>  
<a name="71" href="#71">71</a>      <em class="jxr_javadoccomment">/**</em>
<a name="72" href="#72">72</a>  <em class="jxr_javadoccomment">     * Constant value for 'Anno Hegirae', equivalent</em>
<a name="73" href="#73">73</a>  <em class="jxr_javadoccomment">     * to the value returned for AD/CE.</em>
<a name="74" href="#74">74</a>  <em class="jxr_javadoccomment">     */</em>
<a name="75" href="#75">75</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> AH = DateTimeConstants.CE;
<a name="76" href="#76">76</a>  
<a name="77" href="#77">77</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> A singleton era field. */</em>
<a name="78" href="#78">78</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/goda/time/DateTimeField.html">DateTimeField</a> ERA_FIELD = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/BasicSingleEraDateTimeField.html">BasicSingleEraDateTimeField</a>(<span class="jxr_string">"AH"</span>);
<a name="79" href="#79">79</a>  
<a name="80" href="#80">80</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Leap year 15-based pattern. */</em>
<a name="81" href="#81">81</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> LEAP_YEAR_15_BASED = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a>(0, 623158436);
<a name="82" href="#82">82</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Leap year 16-based pattern. */</em>
<a name="83" href="#83">83</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> LEAP_YEAR_16_BASED = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a>(1, 623191204);
<a name="84" href="#84">84</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Leap year Indian pattern. */</em>
<a name="85" href="#85">85</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> LEAP_YEAR_INDIAN = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a>(2, 690562340);
<a name="86" href="#86">86</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Leap year Habash al-Hasib pattern. */</em>
<a name="87" href="#87">87</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> LEAP_YEAR_HABASH_AL_HASIB = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a>(3, 153692453);
<a name="88" href="#88">88</a>  
<a name="89" href="#89">89</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The lowest year that can be fully supported. */</em>
<a name="90" href="#90">90</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MIN_YEAR = -292269337;
<a name="91" href="#91">91</a>  
<a name="92" href="#92">92</a>      <em class="jxr_javadoccomment">/**</em>
<a name="93" href="#93">93</a>  <em class="jxr_javadoccomment">     * The highest year that can be fully supported.</em>
<a name="94" href="#94">94</a>  <em class="jxr_javadoccomment">     * Although calculateFirstDayOfYearMillis can go higher without</em>
<a name="95" href="#95">95</a>  <em class="jxr_javadoccomment">     * overflowing, the getYear method overflows when it adds the</em>
<a name="96" href="#96">96</a>  <em class="jxr_javadoccomment">     * approximate millis at the epoch.</em>
<a name="97" href="#97">97</a>  <em class="jxr_javadoccomment">     */</em>
<a name="98" href="#98">98</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MAX_YEAR = 292271022;
<a name="99" href="#99">99</a>  
<a name="100" href="#100">100</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The days in a pair of months. */</em>
<a name="101" href="#101">101</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MONTH_PAIR_LENGTH = 59;
<a name="102" href="#102">102</a> 
<a name="103" href="#103">103</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The length of the long month. */</em>
<a name="104" href="#104">104</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> LONG_MONTH_LENGTH = 30;
<a name="105" href="#105">105</a> 
<a name="106" href="#106">106</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The length of the short month. */</em>
<a name="107" href="#107">107</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> SHORT_MONTH_LENGTH = 29;
<a name="108" href="#108">108</a> 
<a name="109" href="#109">109</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The length of the long month in millis. */</em>
<a name="110" href="#110">110</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> MILLIS_PER_MONTH_PAIR = 59L * DateTimeConstants.MILLIS_PER_DAY;
<a name="111" href="#111">111</a> 
<a name="112" href="#112">112</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The length of the long month in millis. */</em>
<a name="113" href="#113">113</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> MILLIS_PER_MONTH = (<strong class="jxr_keyword">long</strong>) (29.53056 * DateTimeConstants.MILLIS_PER_DAY);
<a name="114" href="#114">114</a> 
<a name="115" href="#115">115</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The length of the long month in millis. */</em>
<a name="116" href="#116">116</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> MILLIS_PER_LONG_MONTH = 30L * DateTimeConstants.MILLIS_PER_DAY;
<a name="117" href="#117">117</a> 
<a name="118" href="#118">118</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The typical millis per year. */</em>
<a name="119" href="#119">119</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> MILLIS_PER_YEAR = (<strong class="jxr_keyword">long</strong>) (354.36667 * DateTimeConstants.MILLIS_PER_DAY);
<a name="120" href="#120">120</a> 
<a name="121" href="#121">121</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The typical millis per year. */</em>
<a name="122" href="#122">122</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> MILLIS_PER_SHORT_YEAR = 354L * DateTimeConstants.MILLIS_PER_DAY;
<a name="123" href="#123">123</a> 
<a name="124" href="#124">124</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The typical millis per year. */</em>
<a name="125" href="#125">125</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> MILLIS_PER_LONG_YEAR = 355L * DateTimeConstants.MILLIS_PER_DAY;
<a name="126" href="#126">126</a> 
<a name="127" href="#127">127</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The millis of 0001-01-01. */</em>
<a name="128" href="#128">128</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> MILLIS_YEAR_1 = -42521587200000L;
<a name="129" href="#129">129</a>                                     <em class="jxr_comment">//        -42520809600000L;</em>
<a name="130" href="#130">130</a> <em class="jxr_comment">//    long start = 0L - 278L * DateTimeConstants.MILLIS_PER_DAY;</em>
<a name="131" href="#131">131</a> <em class="jxr_comment">//    long cy = 46L * MILLIS_PER_CYCLE;  // 1381-01-01</em>
<a name="132" href="#132">132</a> <em class="jxr_comment">//    long rem = 5L * MILLIS_PER_SHORT_YEAR +</em>
<a name="133" href="#133">133</a> <em class="jxr_comment">//            3L * MILLIS_PER_LONG_YEAR;  // 1389-01-01</em>
<a name="134" href="#134">134</a> 
<a name="135" href="#135">135</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The length of the cycle of leap years. */</em>
<a name="136" href="#136">136</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> CYCLE = 30;
<a name="137" href="#137">137</a> 
<a name="138" href="#138">138</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The millis of a 30 year cycle. */</em>
<a name="139" href="#139">139</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> MILLIS_PER_CYCLE = ((19L * 354L + 11L * 355L) * DateTimeConstants.MILLIS_PER_DAY);
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Cache of zone to chronology arrays */</em>
<a name="142" href="#142">142</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Map cCache = <strong class="jxr_keyword">new</strong> HashMap();
<a name="143" href="#143">143</a> 
<a name="144" href="#144">144</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Singleton instance of a UTC <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a> */</em>
<a name="145" href="#145">145</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a> INSTANCE_UTC;
<a name="146" href="#146">146</a>     <strong class="jxr_keyword">static</strong> {
<a name="147" href="#147">147</a>         <em class="jxr_comment">// init after static fields</em>
<a name="148" href="#148">148</a>         INSTANCE_UTC = getInstance(DateTimeZone.UTC);
<a name="149" href="#149">149</a>     }
<a name="150" href="#150">150</a> 
<a name="151" href="#151">151</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The leap years to use. */</em>
<a name="152" href="#152">152</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> iLeapYears;
<a name="153" href="#153">153</a> 
<a name="154" href="#154">154</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="155" href="#155">155</a>     <em class="jxr_javadoccomment">/**</em>
<a name="156" href="#156">156</a> <em class="jxr_javadoccomment">     * Gets an instance of the IslamicChronology.</em>
<a name="157" href="#157">157</a> <em class="jxr_javadoccomment">     * The time zone of the returned instance is UTC.</em>
<a name="158" href="#158">158</a> <em class="jxr_javadoccomment">     * </em>
<a name="159" href="#159">159</a> <em class="jxr_javadoccomment">     * @return a singleton UTC instance of the chronology</em>
<a name="160" href="#160">160</a> <em class="jxr_javadoccomment">     */</em>
<a name="161" href="#161">161</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a> getInstanceUTC() {
<a name="162" href="#162">162</a>         <strong class="jxr_keyword">return</strong> INSTANCE_UTC;
<a name="163" href="#163">163</a>     }
<a name="164" href="#164">164</a> 
<a name="165" href="#165">165</a>     <em class="jxr_javadoccomment">/**</em>
<a name="166" href="#166">166</a> <em class="jxr_javadoccomment">     * Gets an instance of the IslamicChronology in the default time zone.</em>
<a name="167" href="#167">167</a> <em class="jxr_javadoccomment">     * </em>
<a name="168" href="#168">168</a> <em class="jxr_javadoccomment">     * @return a chronology in the default time zone</em>
<a name="169" href="#169">169</a> <em class="jxr_javadoccomment">     */</em>
<a name="170" href="#170">170</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a> getInstance() {
<a name="171" href="#171">171</a>         <strong class="jxr_keyword">return</strong> getInstance(DateTimeZone.getDefault(), LEAP_YEAR_16_BASED);
<a name="172" href="#172">172</a>     }
<a name="173" href="#173">173</a> 
<a name="174" href="#174">174</a>     <em class="jxr_javadoccomment">/**</em>
<a name="175" href="#175">175</a> <em class="jxr_javadoccomment">     * Gets an instance of the IslamicChronology in the given time zone.</em>
<a name="176" href="#176">176</a> <em class="jxr_javadoccomment">     * </em>
<a name="177" href="#177">177</a> <em class="jxr_javadoccomment">     * @param zone  the time zone to get the chronology in, null is default</em>
<a name="178" href="#178">178</a> <em class="jxr_javadoccomment">     * @return a chronology in the specified time zone</em>
<a name="179" href="#179">179</a> <em class="jxr_javadoccomment">     */</em>
<a name="180" href="#180">180</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a> getInstance(<a href="../../../../org/goda/time/DateTimeZone.html">DateTimeZone</a> zone) {
<a name="181" href="#181">181</a>         <strong class="jxr_keyword">return</strong> getInstance(zone, LEAP_YEAR_16_BASED);
<a name="182" href="#182">182</a>     }
<a name="183" href="#183">183</a> 
<a name="184" href="#184">184</a>     <em class="jxr_javadoccomment">/**</em>
<a name="185" href="#185">185</a> <em class="jxr_javadoccomment">     * Gets an instance of the IslamicChronology in the given time zone.</em>
<a name="186" href="#186">186</a> <em class="jxr_javadoccomment">     * </em>
<a name="187" href="#187">187</a> <em class="jxr_javadoccomment">     * @param zone  the time zone to get the chronology in, null is default</em>
<a name="188" href="#188">188</a> <em class="jxr_javadoccomment">     * @param leapYears  the type defining the leap year pattern</em>
<a name="189" href="#189">189</a> <em class="jxr_javadoccomment">     * @return a chronology in the specified time zone</em>
<a name="190" href="#190">190</a> <em class="jxr_javadoccomment">     */</em>
<a name="191" href="#191">191</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a> getInstance(<a href="../../../../org/goda/time/DateTimeZone.html">DateTimeZone</a> zone, <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> leapYears) {
<a name="192" href="#192">192</a>         <strong class="jxr_keyword">if</strong> (zone == <strong class="jxr_keyword">null</strong>) {
<a name="193" href="#193">193</a>             zone = DateTimeZone.getDefault();
<a name="194" href="#194">194</a>         }
<a name="195" href="#195">195</a>         <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a> chrono;
<a name="196" href="#196">196</a>         <strong class="jxr_keyword">synchronized</strong> (cCache) {
<a name="197" href="#197">197</a>             <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a>[] chronos = (IslamicChronology[]) cCache.get(zone);
<a name="198" href="#198">198</a>             <strong class="jxr_keyword">if</strong> (chronos == <strong class="jxr_keyword">null</strong>) {
<a name="199" href="#199">199</a>                 chronos = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a>[4];
<a name="200" href="#200">200</a>                 cCache.put(zone, chronos);
<a name="201" href="#201">201</a>             }
<a name="202" href="#202">202</a>             chrono = chronos[leapYears.index];
<a name="203" href="#203">203</a>             <strong class="jxr_keyword">if</strong> (chrono == <strong class="jxr_keyword">null</strong>) {
<a name="204" href="#204">204</a>                 <strong class="jxr_keyword">if</strong> (zone == DateTimeZone.UTC) {
<a name="205" href="#205">205</a>                     <em class="jxr_comment">// First create without a lower limit.</em>
<a name="206" href="#206">206</a>                     chrono = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a>(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, leapYears);
<a name="207" href="#207">207</a>                     <em class="jxr_comment">// Impose lower limit and make another IslamicChronology.</em>
<a name="208" href="#208">208</a>                     <a href="../../../../org/goda/time/DateTime.html">DateTime</a> lowerLimit = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/DateTime.html">DateTime</a>(1, 1, 1, 0, 0, 0, 0, chrono);
<a name="209" href="#209">209</a>                     chrono = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a>(
<a name="210" href="#210">210</a>                         LimitChronology.getInstance(chrono, lowerLimit, <strong class="jxr_keyword">null</strong>),
<a name="211" href="#211">211</a>                          <strong class="jxr_keyword">null</strong>, leapYears);
<a name="212" href="#212">212</a>                 } <strong class="jxr_keyword">else</strong> {
<a name="213" href="#213">213</a>                     chrono = getInstance(DateTimeZone.UTC, leapYears);
<a name="214" href="#214">214</a>                     chrono = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a>
<a name="215" href="#215">215</a>                         (ZonedChronology.getInstance(chrono, zone), <strong class="jxr_keyword">null</strong>, leapYears);
<a name="216" href="#216">216</a>                 }
<a name="217" href="#217">217</a>                 chronos[leapYears.index] = chrono;
<a name="218" href="#218">218</a>             }
<a name="219" href="#219">219</a>         }
<a name="220" href="#220">220</a>         <strong class="jxr_keyword">return</strong> chrono;
<a name="221" href="#221">221</a>     }
<a name="222" href="#222">222</a> 
<a name="223" href="#223">223</a>     <em class="jxr_comment">// Constructors and instance variables</em>
<a name="224" href="#224">224</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="225" href="#225">225</a>     <em class="jxr_javadoccomment">/**</em>
<a name="226" href="#226">226</a> <em class="jxr_javadoccomment">     * Restricted constructor.</em>
<a name="227" href="#227">227</a> <em class="jxr_javadoccomment">     */</em>
<a name="228" href="#228">228</a>     <a href="../../../../org/goda/time/chrono/IslamicChronology.html">IslamicChronology</a>(<a href="../../../../org/goda/time/Chronology.html">Chronology</a> base, Object param, <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> leapYears) {
<a name="229" href="#229">229</a>         <strong class="jxr_keyword">super</strong>(base, param, 4);
<a name="230" href="#230">230</a>         <strong class="jxr_keyword">this</strong>.iLeapYears = leapYears;
<a name="231" href="#231">231</a>     }
<a name="232" href="#232">232</a> 
<a name="233" href="#233">233</a>     <em class="jxr_javadoccomment">/**</em>
<a name="234" href="#234">234</a> <em class="jxr_javadoccomment">     * Serialization singleton.</em>
<a name="235" href="#235">235</a> <em class="jxr_javadoccomment">     */</em>
<a name="236" href="#236">236</a>     <strong class="jxr_keyword">private</strong> Object readResolve() {
<a name="237" href="#237">237</a>         <a href="../../../../org/goda/time/Chronology.html">Chronology</a> base = getBase();
<a name="238" href="#238">238</a>         <strong class="jxr_keyword">return</strong> base == <strong class="jxr_keyword">null</strong> ? getInstanceUTC() : getInstance(base.getZone());
<a name="239" href="#239">239</a>     }
<a name="240" href="#240">240</a> 
<a name="241" href="#241">241</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="242" href="#242">242</a>     <em class="jxr_javadoccomment">/**</em>
<a name="243" href="#243">243</a> <em class="jxr_javadoccomment">     * Gets the leap year pattern type.</em>
<a name="244" href="#244">244</a> <em class="jxr_javadoccomment">     *</em>
<a name="245" href="#245">245</a> <em class="jxr_javadoccomment">     * @return the pattern type</em>
<a name="246" href="#246">246</a> <em class="jxr_javadoccomment">     */</em>
<a name="247" href="#247">247</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> getLeapYearPatternType() {
<a name="248" href="#248">248</a>         <strong class="jxr_keyword">return</strong> iLeapYears;
<a name="249" href="#249">249</a>     }
<a name="250" href="#250">250</a> 
<a name="251" href="#251">251</a>     <em class="jxr_comment">// Conversion</em>
<a name="252" href="#252">252</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="253" href="#253">253</a>     <em class="jxr_javadoccomment">/**</em>
<a name="254" href="#254">254</a> <em class="jxr_javadoccomment">     * Gets the Chronology in the UTC time zone.</em>
<a name="255" href="#255">255</a> <em class="jxr_javadoccomment">     * </em>
<a name="256" href="#256">256</a> <em class="jxr_javadoccomment">     * @return the chronology in UTC</em>
<a name="257" href="#257">257</a> <em class="jxr_javadoccomment">     */</em>
<a name="258" href="#258">258</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/goda/time/Chronology.html">Chronology</a> withUTC() {
<a name="259" href="#259">259</a>         <strong class="jxr_keyword">return</strong> INSTANCE_UTC;
<a name="260" href="#260">260</a>     }
<a name="261" href="#261">261</a> 
<a name="262" href="#262">262</a>     <em class="jxr_javadoccomment">/**</em>
<a name="263" href="#263">263</a> <em class="jxr_javadoccomment">     * Gets the Chronology in a specific time zone.</em>
<a name="264" href="#264">264</a> <em class="jxr_javadoccomment">     * </em>
<a name="265" href="#265">265</a> <em class="jxr_javadoccomment">     * @param zone  the zone to get the chronology in, null is default</em>
<a name="266" href="#266">266</a> <em class="jxr_javadoccomment">     * @return the chronology</em>
<a name="267" href="#267">267</a> <em class="jxr_javadoccomment">     */</em>
<a name="268" href="#268">268</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/goda/time/Chronology.html">Chronology</a> withZone(<a href="../../../../org/goda/time/DateTimeZone.html">DateTimeZone</a> zone) {
<a name="269" href="#269">269</a>         <strong class="jxr_keyword">if</strong> (zone == <strong class="jxr_keyword">null</strong>) {
<a name="270" href="#270">270</a>             zone = DateTimeZone.getDefault();
<a name="271" href="#271">271</a>         }
<a name="272" href="#272">272</a>         <strong class="jxr_keyword">if</strong> (zone == getZone()) {
<a name="273" href="#273">273</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="274" href="#274">274</a>         }
<a name="275" href="#275">275</a>         <strong class="jxr_keyword">return</strong> getInstance(zone);
<a name="276" href="#276">276</a>     }
<a name="277" href="#277">277</a> 
<a name="278" href="#278">278</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="279" href="#279">279</a>     <strong class="jxr_keyword">int</strong> getYear(<strong class="jxr_keyword">long</strong> instant) {
<a name="280" href="#280">280</a>         <strong class="jxr_keyword">long</strong> millisIslamic = instant - MILLIS_YEAR_1;
<a name="281" href="#281">281</a>         <strong class="jxr_keyword">long</strong> cycles = millisIslamic / MILLIS_PER_CYCLE;
<a name="282" href="#282">282</a>         <strong class="jxr_keyword">long</strong> cycleRemainder = millisIslamic % MILLIS_PER_CYCLE;
<a name="283" href="#283">283</a>         
<a name="284" href="#284">284</a>         <strong class="jxr_keyword">int</strong> year = (<strong class="jxr_keyword">int</strong>) ((cycles * CYCLE) + 1L);
<a name="285" href="#285">285</a>         <strong class="jxr_keyword">long</strong> yearMillis = (isLeapYear(year) ? MILLIS_PER_LONG_YEAR : MILLIS_PER_SHORT_YEAR);
<a name="286" href="#286">286</a>         <strong class="jxr_keyword">while</strong> (cycleRemainder &gt;= yearMillis) {
<a name="287" href="#287">287</a>             cycleRemainder -= yearMillis;
<a name="288" href="#288">288</a>             yearMillis = (isLeapYear(++year) ? MILLIS_PER_LONG_YEAR : MILLIS_PER_SHORT_YEAR);
<a name="289" href="#289">289</a>         }
<a name="290" href="#290">290</a>         <strong class="jxr_keyword">return</strong> year;
<a name="291" href="#291">291</a>     }
<a name="292" href="#292">292</a> 
<a name="293" href="#293">293</a>     <strong class="jxr_keyword">long</strong> setYear(<strong class="jxr_keyword">long</strong> instant, <strong class="jxr_keyword">int</strong> year) {
<a name="294" href="#294">294</a>         <em class="jxr_comment">// optimsed implementation of set, due to fixed months</em>
<a name="295" href="#295">295</a>         <strong class="jxr_keyword">int</strong> thisYear = getYear(instant);
<a name="296" href="#296">296</a>         <strong class="jxr_keyword">int</strong> dayOfYear = getDayOfYear(instant, thisYear);
<a name="297" href="#297">297</a>         <strong class="jxr_keyword">int</strong> millisOfDay = getMillisOfDay(instant);
<a name="298" href="#298">298</a> 
<a name="299" href="#299">299</a>         <strong class="jxr_keyword">if</strong> (dayOfYear &gt; 354) {
<a name="300" href="#300">300</a>             <em class="jxr_comment">// Current year is leap, and day is leap.</em>
<a name="301" href="#301">301</a>             <strong class="jxr_keyword">if</strong> (!isLeapYear(year)) {
<a name="302" href="#302">302</a>                 <em class="jxr_comment">// Moving to a non-leap year, leap day doesn't exist.</em>
<a name="303" href="#303">303</a>                 dayOfYear--;
<a name="304" href="#304">304</a>             }
<a name="305" href="#305">305</a>         }
<a name="306" href="#306">306</a> 
<a name="307" href="#307">307</a>         instant = getYearMonthDayMillis(year, 1, dayOfYear);
<a name="308" href="#308">308</a>         instant += millisOfDay;
<a name="309" href="#309">309</a>         <strong class="jxr_keyword">return</strong> instant;
<a name="310" href="#310">310</a>     }
<a name="311" href="#311">311</a> 
<a name="312" href="#312">312</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="313" href="#313">313</a>     <strong class="jxr_keyword">long</strong> getYearDifference(<strong class="jxr_keyword">long</strong> minuendInstant, <strong class="jxr_keyword">long</strong> subtrahendInstant) {
<a name="314" href="#314">314</a>         <em class="jxr_comment">// optimsed implementation of getDifference, due to fixed months</em>
<a name="315" href="#315">315</a>         <strong class="jxr_keyword">int</strong> minuendYear = getYear(minuendInstant);
<a name="316" href="#316">316</a>         <strong class="jxr_keyword">int</strong> subtrahendYear = getYear(subtrahendInstant);
<a name="317" href="#317">317</a> 
<a name="318" href="#318">318</a>         <em class="jxr_comment">// Inlined remainder method to avoid duplicate calls to get.</em>
<a name="319" href="#319">319</a>         <strong class="jxr_keyword">long</strong> minuendRem = minuendInstant - getYearMillis(minuendYear);
<a name="320" href="#320">320</a>         <strong class="jxr_keyword">long</strong> subtrahendRem = subtrahendInstant - getYearMillis(subtrahendYear);
<a name="321" href="#321">321</a> 
<a name="322" href="#322">322</a>         <strong class="jxr_keyword">int</strong> difference = minuendYear - subtrahendYear;
<a name="323" href="#323">323</a>         <strong class="jxr_keyword">if</strong> (minuendRem &lt; subtrahendRem) {
<a name="324" href="#324">324</a>             difference--;
<a name="325" href="#325">325</a>         }
<a name="326" href="#326">326</a>         <strong class="jxr_keyword">return</strong> difference;
<a name="327" href="#327">327</a>     }
<a name="328" href="#328">328</a> 
<a name="329" href="#329">329</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="330" href="#330">330</a>     <strong class="jxr_keyword">long</strong> getTotalMillisByYearMonth(<strong class="jxr_keyword">int</strong> year, <strong class="jxr_keyword">int</strong> month) {
<a name="331" href="#331">331</a>         <strong class="jxr_keyword">if</strong> (--month % 2 == 1) {
<a name="332" href="#332">332</a>             month /= 2;
<a name="333" href="#333">333</a>             <strong class="jxr_keyword">return</strong> month * MILLIS_PER_MONTH_PAIR + MILLIS_PER_LONG_MONTH;
<a name="334" href="#334">334</a>         } <strong class="jxr_keyword">else</strong> {
<a name="335" href="#335">335</a>             month /= 2;
<a name="336" href="#336">336</a>             <strong class="jxr_keyword">return</strong> month * MILLIS_PER_MONTH_PAIR;
<a name="337" href="#337">337</a>         }
<a name="338" href="#338">338</a>     }
<a name="339" href="#339">339</a> 
<a name="340" href="#340">340</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="341" href="#341">341</a>     <strong class="jxr_keyword">int</strong> getDayOfMonth(<strong class="jxr_keyword">long</strong> millis) {
<a name="342" href="#342">342</a>         <em class="jxr_comment">// optimised for simple months</em>
<a name="343" href="#343">343</a>         <strong class="jxr_keyword">int</strong> doy = getDayOfYear(millis) - 1;
<a name="344" href="#344">344</a>         <strong class="jxr_keyword">if</strong> (doy == 354) {
<a name="345" href="#345">345</a>             <strong class="jxr_keyword">return</strong> 30;
<a name="346" href="#346">346</a>         }
<a name="347" href="#347">347</a>         <strong class="jxr_keyword">return</strong> (doy % MONTH_PAIR_LENGTH) % LONG_MONTH_LENGTH + 1;
<a name="348" href="#348">348</a>     }
<a name="349" href="#349">349</a> 
<a name="350" href="#350">350</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="351" href="#351">351</a>     <strong class="jxr_keyword">boolean</strong> isLeapYear(<strong class="jxr_keyword">int</strong> year) {
<a name="352" href="#352">352</a>         <strong class="jxr_keyword">return</strong> iLeapYears.isLeapYear(year);
<a name="353" href="#353">353</a>     }
<a name="354" href="#354">354</a> 
<a name="355" href="#355">355</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="356" href="#356">356</a>     <strong class="jxr_keyword">int</strong> getDaysInYearMax() {
<a name="357" href="#357">357</a>         <strong class="jxr_keyword">return</strong> 355;
<a name="358" href="#358">358</a>     }
<a name="359" href="#359">359</a> 
<a name="360" href="#360">360</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="361" href="#361">361</a>     <strong class="jxr_keyword">int</strong> getDaysInYear(<strong class="jxr_keyword">int</strong> year) {
<a name="362" href="#362">362</a>         <strong class="jxr_keyword">return</strong> isLeapYear(year) ? 355 : 354;
<a name="363" href="#363">363</a>     }
<a name="364" href="#364">364</a> 
<a name="365" href="#365">365</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="366" href="#366">366</a>     <strong class="jxr_keyword">int</strong> getDaysInYearMonth(<strong class="jxr_keyword">int</strong> year, <strong class="jxr_keyword">int</strong> month) {
<a name="367" href="#367">367</a>         <strong class="jxr_keyword">if</strong> (month == 12 &amp;&amp; isLeapYear(year)) {
<a name="368" href="#368">368</a>             <strong class="jxr_keyword">return</strong> LONG_MONTH_LENGTH;
<a name="369" href="#369">369</a>         }
<a name="370" href="#370">370</a>         <strong class="jxr_keyword">return</strong> (--month % 2 == 0 ? LONG_MONTH_LENGTH : SHORT_MONTH_LENGTH);
<a name="371" href="#371">371</a>     }
<a name="372" href="#372">372</a> 
<a name="373" href="#373">373</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="374" href="#374">374</a>     <strong class="jxr_keyword">int</strong> getDaysInMonthMax() {
<a name="375" href="#375">375</a>         <strong class="jxr_keyword">return</strong> LONG_MONTH_LENGTH;
<a name="376" href="#376">376</a>     }
<a name="377" href="#377">377</a> 
<a name="378" href="#378">378</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="379" href="#379">379</a>     <strong class="jxr_keyword">int</strong> getDaysInMonthMax(<strong class="jxr_keyword">int</strong> month) {
<a name="380" href="#380">380</a>         <strong class="jxr_keyword">if</strong> (month == 12) {
<a name="381" href="#381">381</a>             <strong class="jxr_keyword">return</strong> LONG_MONTH_LENGTH;
<a name="382" href="#382">382</a>         }
<a name="383" href="#383">383</a>         <strong class="jxr_keyword">return</strong> (--month % 2 == 0 ? LONG_MONTH_LENGTH : SHORT_MONTH_LENGTH);
<a name="384" href="#384">384</a>     }
<a name="385" href="#385">385</a> 
<a name="386" href="#386">386</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="387" href="#387">387</a>     <strong class="jxr_keyword">int</strong> getMonthOfYear(<strong class="jxr_keyword">long</strong> millis, <strong class="jxr_keyword">int</strong> year) {
<a name="388" href="#388">388</a>         <strong class="jxr_keyword">int</strong> doyZeroBased = (<strong class="jxr_keyword">int</strong>) ((millis - getYearMillis(year)) / DateTimeConstants.MILLIS_PER_DAY);
<a name="389" href="#389">389</a>         <strong class="jxr_keyword">if</strong> (doyZeroBased == 354) {
<a name="390" href="#390">390</a>             <strong class="jxr_keyword">return</strong> 12;
<a name="391" href="#391">391</a>         }
<a name="392" href="#392">392</a>         <strong class="jxr_keyword">return</strong> ((doyZeroBased * 2) / MONTH_PAIR_LENGTH) + 1;
<a name="393" href="#393">393</a> <em class="jxr_comment">//        return (int) (doyZeroBased / 29.9f) + 1;</em>
<a name="394" href="#394">394</a> <em class="jxr_comment">//        </em>
<a name="395" href="#395">395</a> <em class="jxr_comment">//        int monthPairZeroBased = doyZeroBased / MONTH_PAIR_LENGTH;</em>
<a name="396" href="#396">396</a> <em class="jxr_comment">//        int monthPairRemainder = doyZeroBased % MONTH_PAIR_LENGTH;</em>
<a name="397" href="#397">397</a> <em class="jxr_comment">//        return (monthPairZeroBased * 2) + 1 + (monthPairRemainder &gt;= LONG_MONTH_LENGTH ? 1 : 0);</em>
<a name="398" href="#398">398</a>     }
<a name="399" href="#399">399</a> 
<a name="400" href="#400">400</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="401" href="#401">401</a>     <strong class="jxr_keyword">long</strong> getAverageMillisPerYear() {
<a name="402" href="#402">402</a>         <strong class="jxr_keyword">return</strong> MILLIS_PER_YEAR;
<a name="403" href="#403">403</a>     }
<a name="404" href="#404">404</a> 
<a name="405" href="#405">405</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="406" href="#406">406</a>     <strong class="jxr_keyword">long</strong> getAverageMillisPerYearDividedByTwo() {
<a name="407" href="#407">407</a>         <strong class="jxr_keyword">return</strong> MILLIS_PER_YEAR / 2;
<a name="408" href="#408">408</a>     }
<a name="409" href="#409">409</a> 
<a name="410" href="#410">410</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="411" href="#411">411</a>     <strong class="jxr_keyword">long</strong> getAverageMillisPerMonth() {
<a name="412" href="#412">412</a>         <strong class="jxr_keyword">return</strong> MILLIS_PER_MONTH;
<a name="413" href="#413">413</a>     }
<a name="414" href="#414">414</a> 
<a name="415" href="#415">415</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="416" href="#416">416</a>     <strong class="jxr_keyword">long</strong> calculateFirstDayOfYearMillis(<strong class="jxr_keyword">int</strong> year) {
<a name="417" href="#417">417</a>         <strong class="jxr_keyword">if</strong> (year &gt; MAX_YEAR) {
<a name="418" href="#418">418</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ArithmeticException(<span class="jxr_string">"Year is too large: "</span> + year + <span class="jxr_string">" &gt; "</span> + MAX_YEAR);
<a name="419" href="#419">419</a>         }
<a name="420" href="#420">420</a>         <strong class="jxr_keyword">if</strong> (year &lt; MIN_YEAR) {
<a name="421" href="#421">421</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ArithmeticException(<span class="jxr_string">"Year is too small: "</span> + year + <span class="jxr_string">" &lt; "</span> + MIN_YEAR);
<a name="422" href="#422">422</a>         }
<a name="423" href="#423">423</a> 
<a name="424" href="#424">424</a>         <em class="jxr_comment">// Java epoch is 1970-01-01 Gregorian which is 0622-07-16 Islamic.</em>
<a name="425" href="#425">425</a>         <em class="jxr_comment">// 0001-01-01 Islamic is -42520809600000L</em>
<a name="426" href="#426">426</a>         <em class="jxr_comment">// would prefer to calculate against year zero, but leap year</em>
<a name="427" href="#427">427</a>         <em class="jxr_comment">// can be in that year so it doesn't work</em>
<a name="428" href="#428">428</a>         year--;
<a name="429" href="#429">429</a>         <strong class="jxr_keyword">long</strong> cycle = year / CYCLE;
<a name="430" href="#430">430</a>         <strong class="jxr_keyword">long</strong> millis = MILLIS_YEAR_1 + cycle * MILLIS_PER_CYCLE;
<a name="431" href="#431">431</a>         <strong class="jxr_keyword">int</strong> cycleRemainder = (year % CYCLE) + 1;
<a name="432" href="#432">432</a>         
<a name="433" href="#433">433</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 1; i &lt; cycleRemainder; i++) {
<a name="434" href="#434">434</a>             millis += (isLeapYear(i) ? MILLIS_PER_LONG_YEAR : MILLIS_PER_SHORT_YEAR);
<a name="435" href="#435">435</a>         }
<a name="436" href="#436">436</a>         
<a name="437" href="#437">437</a>         <strong class="jxr_keyword">return</strong> millis;
<a name="438" href="#438">438</a>     }
<a name="439" href="#439">439</a> 
<a name="440" href="#440">440</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="441" href="#441">441</a>     <strong class="jxr_keyword">int</strong> getMinYear() {
<a name="442" href="#442">442</a>         <strong class="jxr_keyword">return</strong> 1; <em class="jxr_comment">//MIN_YEAR;</em>
<a name="443" href="#443">443</a>     }
<a name="444" href="#444">444</a> 
<a name="445" href="#445">445</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="446" href="#446">446</a>     <strong class="jxr_keyword">int</strong> getMaxYear() {
<a name="447" href="#447">447</a>         <strong class="jxr_keyword">return</strong> MAX_YEAR;
<a name="448" href="#448">448</a>     }
<a name="449" href="#449">449</a> 
<a name="450" href="#450">450</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="451" href="#451">451</a>     <strong class="jxr_keyword">long</strong> getApproxMillisAtEpochDividedByTwo() {
<a name="452" href="#452">452</a>         <em class="jxr_comment">// Epoch 1970-01-01 ISO = 1389-10-22 Islamic</em>
<a name="453" href="#453">453</a>         <strong class="jxr_keyword">return</strong> (-MILLIS_YEAR_1) / 2;
<a name="454" href="#454">454</a>     }
<a name="455" href="#455">455</a> 
<a name="456" href="#456">456</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="457" href="#457">457</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> assemble(<a href="../../../../org/goda/time/chrono/AssembledChronology.html">Fields</a> fields) {
<a name="458" href="#458">458</a>         <strong class="jxr_keyword">if</strong> (getBase() == <strong class="jxr_keyword">null</strong>) {
<a name="459" href="#459">459</a>             <strong class="jxr_keyword">super</strong>.assemble(fields);
<a name="460" href="#460">460</a> 
<a name="461" href="#461">461</a>             fields.era = ERA_FIELD;
<a name="462" href="#462">462</a>             fields.monthOfYear = <strong class="jxr_keyword">new</strong> <a href="../../../../org/goda/time/chrono/BasicMonthOfYearDateTimeField.html">BasicMonthOfYearDateTimeField</a>(<strong class="jxr_keyword">this</strong>, 12);
<a name="463" href="#463">463</a>             fields.months = fields.monthOfYear.getDurationField();
<a name="464" href="#464">464</a>         }
<a name="465" href="#465">465</a>     }
<a name="466" href="#466">466</a> 
<a name="467" href="#467">467</a>     <em class="jxr_comment">//-----------------------------------------------------------------------</em>
<a name="468" href="#468">468</a>     <em class="jxr_javadoccomment">/**</em>
<a name="469" href="#469">469</a> <em class="jxr_javadoccomment">     * Opaque object describing a leap year pattern for the Islamic Chronology.</em>
<a name="470" href="#470">470</a> <em class="jxr_javadoccomment">     *</em>
<a name="471" href="#471">471</a> <em class="jxr_javadoccomment">     * @since 1.2</em>
<a name="472" href="#472">472</a> <em class="jxr_javadoccomment">     */</em>
<a name="473" href="#473">473</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a> implements Serializable {
<a name="474" href="#474">474</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Serialization lock */</em>
<a name="475" href="#475">475</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = 26581275372698L;
<a name="476" href="#476">476</a> <em class="jxr_comment">//        </em><em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Leap year raw data encoded into bits. */</em>
<a name="477" href="#477">477</a> <em class="jxr_comment">//        private static final int[][] LEAP_YEARS = {</em>
<a name="478" href="#478">478</a> <em class="jxr_comment">//            {2, 5, 7, 10, 13, 15, 18, 21, 24, 26, 29},  // 623158436</em>
<a name="479" href="#479">479</a> <em class="jxr_comment">//            {2, 5, 7, 10, 13, 16, 18, 21, 24, 26, 29},  // 623191204</em>
<a name="480" href="#480">480</a> <em class="jxr_comment">//            {2, 5, 8, 10, 13, 16, 19, 21, 24, 27, 29},  // 690562340</em>
<a name="481" href="#481">481</a> <em class="jxr_comment">//            {0, 2, 5, 8, 11, 13, 16, 19, 21, 24, 27},   // 153692453</em>
<a name="482" href="#482">482</a> <em class="jxr_comment">//        };</em>
<a name="483" href="#483">483</a>         
<a name="484" href="#484">484</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The index. */</em>
<a name="485" href="#485">485</a>         <strong class="jxr_keyword">final</strong> byte index;
<a name="486" href="#486">486</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The leap year pattern, a bit-based 1=true pattern. */</em>
<a name="487" href="#487">487</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> pattern;
<a name="488" href="#488">488</a>         
<a name="489" href="#489">489</a>         <em class="jxr_javadoccomment">/**</em>
<a name="490" href="#490">490</a> <em class="jxr_javadoccomment">         * Constructor.</em>
<a name="491" href="#491">491</a> <em class="jxr_javadoccomment">         * This constructor takes a bit pattern where bits 0-29 correspond</em>
<a name="492" href="#492">492</a> <em class="jxr_javadoccomment">         * to years 0-29 in the 30 year Islamic cycle of years. This allows</em>
<a name="493" href="#493">493</a> <em class="jxr_javadoccomment">         * a highly efficient lookup by bit-matching.</em>
<a name="494" href="#494">494</a> <em class="jxr_javadoccomment">         *</em>
<a name="495" href="#495">495</a> <em class="jxr_javadoccomment">         * @param index  the index</em>
<a name="496" href="#496">496</a> <em class="jxr_javadoccomment">         * @param pattern  the bit pattern</em>
<a name="497" href="#497">497</a> <em class="jxr_javadoccomment">         */</em>
<a name="498" href="#498">498</a>         <a href="../../../../org/goda/time/chrono/IslamicChronology.html">LeapYearPatternType</a>(<strong class="jxr_keyword">int</strong> index, <strong class="jxr_keyword">int</strong> pattern) {
<a name="499" href="#499">499</a>             <strong class="jxr_keyword">super</strong>();
<a name="500" href="#500">500</a>             <strong class="jxr_keyword">this</strong>.index = (byte) index;
<a name="501" href="#501">501</a>             <strong class="jxr_keyword">this</strong>.pattern = pattern;
<a name="502" href="#502">502</a>         }
<a name="503" href="#503">503</a>         
<a name="504" href="#504">504</a>         <em class="jxr_javadoccomment">/**</em>
<a name="505" href="#505">505</a> <em class="jxr_javadoccomment">         * Is the year a leap year.</em>
<a name="506" href="#506">506</a> <em class="jxr_javadoccomment">         * @param year  the year to query</em>
<a name="507" href="#507">507</a> <em class="jxr_javadoccomment">         * @return true if leap</em>
<a name="508" href="#508">508</a> <em class="jxr_javadoccomment">         */</em>
<a name="509" href="#509">509</a>         <strong class="jxr_keyword">boolean</strong> isLeapYear(<strong class="jxr_keyword">int</strong> year) {
<a name="510" href="#510">510</a>             <strong class="jxr_keyword">int</strong> key = 1 &lt;&lt; (year % 30);
<a name="511" href="#511">511</a>             <strong class="jxr_keyword">return</strong> ((pattern &amp; key) &gt; 0);
<a name="512" href="#512">512</a>         }
<a name="513" href="#513">513</a>         
<a name="514" href="#514">514</a>         <em class="jxr_javadoccomment">/**</em>
<a name="515" href="#515">515</a> <em class="jxr_javadoccomment">         * Ensure a singleton is returned if possible.</em>
<a name="516" href="#516">516</a> <em class="jxr_javadoccomment">         * @return the singleton instance</em>
<a name="517" href="#517">517</a> <em class="jxr_javadoccomment">         */</em>
<a name="518" href="#518">518</a>         <strong class="jxr_keyword">private</strong> Object readResolve() {
<a name="519" href="#519">519</a>             <strong class="jxr_keyword">switch</strong> (index) {
<a name="520" href="#520">520</a>                 <strong class="jxr_keyword">case</strong> 0:
<a name="521" href="#521">521</a>                     <strong class="jxr_keyword">return</strong> LEAP_YEAR_15_BASED;
<a name="522" href="#522">522</a>                 <strong class="jxr_keyword">case</strong> 1:
<a name="523" href="#523">523</a>                     <strong class="jxr_keyword">return</strong> LEAP_YEAR_16_BASED;
<a name="524" href="#524">524</a>                 <strong class="jxr_keyword">case</strong> 2:
<a name="525" href="#525">525</a>                     <strong class="jxr_keyword">return</strong> LEAP_YEAR_INDIAN;
<a name="526" href="#526">526</a>                 <strong class="jxr_keyword">case</strong> 3:
<a name="527" href="#527">527</a>                     <strong class="jxr_keyword">return</strong> LEAP_YEAR_HABASH_AL_HASIB;
<a name="528" href="#528">528</a>                 <strong class="jxr_keyword">default</strong>:
<a name="529" href="#529">529</a>                     <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="530" href="#530">530</a>             }
<a name="531" href="#531">531</a>         }
<a name="532" href="#532">532</a>     }
<a name="533" href="#533">533</a> }
</pre>
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